20301000521 has 2 divisors, whose sum is σ = 20301000522. Its totient is φ = 20301000520.

The previous prime is 20301000443. The next prime is 20301000523. The reversal of 20301000521 is 12500010302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10723638025 + 9577362496 = 103555^2 + 97864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20301000521 is a prime.

It is a Sophie Germain prime.

Together with 20301000523, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20301000496 and 20301000505.

It is not a weakly prime, because it can be changed into another prime (20301000523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10150500260 + 10150500261.

It is an arithmetic number, because the mean of its divisors is an integer number (10150500261).

Almost surely, 2^20301000521 is an apocalyptic number.

It is an amenable number.

20301000521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20301000521 is an equidigital number, since it uses as much as digits as its factorization.

20301000521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 14.

Adding to 20301000521 its reverse (12500010302), we get a palindrome (32801010823).

The spelling of 20301000521 in words is "twenty billion, three hundred one million, five hundred twenty-one", and thus it is an aban number.